137 lines
3.8 KiB
C
137 lines
3.8 KiB
C
/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
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/* Copyright (C) 2019 Netronome Systems, Inc. */
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#ifndef _NFP_DP_NFDK_H_
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#define _NFP_DP_NFDK_H_
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#include <linux/bitops.h>
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#include <linux/types.h>
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#define NFDK_TX_DESC_PER_SIMPLE_PKT 2
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#define NFDK_TX_MAX_DATA_PER_HEAD SZ_4K
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#define NFDK_TX_MAX_DATA_PER_DESC SZ_16K
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#define NFDK_TX_DESC_BLOCK_SZ 256
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#define NFDK_TX_DESC_BLOCK_CNT (NFDK_TX_DESC_BLOCK_SZ / \
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sizeof(struct nfp_nfdk_tx_desc))
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#define NFDK_TX_DESC_STOP_CNT (NFDK_TX_DESC_BLOCK_CNT * \
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NFDK_TX_DESC_PER_SIMPLE_PKT)
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#define NFDK_TX_MAX_DATA_PER_BLOCK SZ_64K
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#define NFDK_TX_DESC_GATHER_MAX 17
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/* TX descriptor format */
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#define NFDK_DESC_TX_MSS_MASK GENMASK(13, 0)
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#define NFDK_DESC_TX_CHAIN_META BIT(3)
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#define NFDK_DESC_TX_ENCAP BIT(2)
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#define NFDK_DESC_TX_L4_CSUM BIT(1)
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#define NFDK_DESC_TX_L3_CSUM BIT(0)
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#define NFDK_DESC_TX_DMA_LEN_HEAD GENMASK(11, 0)
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#define NFDK_DESC_TX_TYPE_HEAD GENMASK(15, 12)
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#define NFDK_DESC_TX_DMA_LEN GENMASK(13, 0)
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#define NFDK_DESC_TX_TYPE_NOP 0
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#define NFDK_DESC_TX_TYPE_GATHER 1
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#define NFDK_DESC_TX_TYPE_TSO 2
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#define NFDK_DESC_TX_TYPE_SIMPLE 8
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#define NFDK_DESC_TX_EOP BIT(14)
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#define NFDK_META_LEN GENMASK(7, 0)
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#define NFDK_META_FIELDS GENMASK(31, 8)
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#define D_BLOCK_CPL(idx) (NFDK_TX_DESC_BLOCK_CNT - \
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(idx) % NFDK_TX_DESC_BLOCK_CNT)
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struct nfp_nfdk_tx_desc {
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union {
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struct {
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__le16 dma_addr_hi; /* High bits of host buf address */
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__le16 dma_len_type; /* Length to DMA for this desc */
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__le32 dma_addr_lo; /* Low 32bit of host buf addr */
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};
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struct {
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__le16 mss; /* MSS to be used for LSO */
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u8 lso_hdrlen; /* LSO, TCP payload offset */
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u8 lso_totsegs; /* LSO, total segments */
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u8 l3_offset; /* L3 header offset */
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u8 l4_offset; /* L4 header offset */
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__le16 lso_meta_res; /* Rsvd bits in TSO metadata */
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};
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struct {
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u8 flags; /* TX Flags, see @NFDK_DESC_TX_* */
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u8 reserved[7]; /* meta byte placeholder */
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};
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__le32 vals[2];
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__le64 raw;
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};
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};
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/* The device don't make use of the 2 or 3 least significant bits of the address
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* due to alignment constraints. The driver can make use of those bits to carry
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* information about the buffer before giving it to the device.
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*
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* NOTE: The driver must clear the lower bits before handing the buffer to the
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* device.
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*
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* - NFDK_TX_BUF_INFO_SOP - Start of a packet
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* Mark the buffer as a start of a packet. This is used in the XDP TX process
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* to stash virtual and DMA address so that they can be recycled when the TX
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* operation is completed.
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*/
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#define NFDK_TX_BUF_PTR(val) ((val) & ~(sizeof(void *) - 1))
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#define NFDK_TX_BUF_INFO(val) ((val) & (sizeof(void *) - 1))
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#define NFDK_TX_BUF_INFO_SOP BIT(0)
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struct nfp_nfdk_tx_buf {
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union {
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/* First slot */
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union {
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struct sk_buff *skb;
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void *frag;
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unsigned long val;
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};
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/* 1 + nr_frags next slots */
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dma_addr_t dma_addr;
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/* TSO (optional) */
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struct {
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u32 pkt_cnt;
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u32 real_len;
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};
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u64 raw;
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};
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};
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static inline int nfp_nfdk_headlen_to_segs(unsigned int headlen)
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{
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/* First descriptor fits less data, so adjust for that */
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return DIV_ROUND_UP(headlen +
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NFDK_TX_MAX_DATA_PER_DESC -
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NFDK_TX_MAX_DATA_PER_HEAD,
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NFDK_TX_MAX_DATA_PER_DESC);
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}
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int nfp_nfdk_poll(struct napi_struct *napi, int budget);
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netdev_tx_t nfp_nfdk_tx(struct sk_buff *skb, struct net_device *netdev);
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bool
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nfp_nfdk_ctrl_tx_one(struct nfp_net *nn, struct nfp_net_r_vector *r_vec,
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struct sk_buff *skb, bool old);
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void nfp_nfdk_ctrl_poll(struct tasklet_struct *t);
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void nfp_nfdk_rx_ring_fill_freelist(struct nfp_net_dp *dp,
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struct nfp_net_rx_ring *rx_ring);
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#ifndef CONFIG_NFP_NET_IPSEC
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static inline u64 nfp_nfdk_ipsec_tx(u64 flags, struct sk_buff *skb)
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{
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return flags;
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}
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#else
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u64 nfp_nfdk_ipsec_tx(u64 flags, struct sk_buff *skb);
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#endif
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#endif
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